The First General Method for Palladium-Catalyzed Negishi Cross-Coupling of Aryl and Vinyl Chlorides: Use of Commercially Available Pd(P(<i>t</i>-Bu)<sub>3</sub>)<sub>2</sub> as a Catalyst
作者:Chaoyang Dai、Gregory C. Fu
DOI:10.1021/ja003954y
日期:2001.3.1
With a single protocol, commerciallyavailable Pd(P(t-Bu)(3))(2) can effect the Negishi cross-coupling of a wide range of aryl and vinyl chlorides with aryl- and alkylzinc reagents. The process tolerates nitro groups, and it efficiently generates sterically hindered biaryls. In addition, a high turnover number (>3000) can be achieved.
Palladium−Phosphinous Acid-Catalyzed Cross-Coupling of Aryl and Acyl Halides with Aryl-, Alkyl-, and Vinylzinc Reagents
作者:Hanhui Xu、Kekeli Ekoue-Kovi、Christian Wolf
DOI:10.1021/jo801445y
日期:2008.10.3
biaryls in up to 92% yield. Arylhalides also undergo POPd7-catalyzed aryl-vinyl and aryl-alkyl bond formation under mild conditions. Styrenes and alkylarenes were prepared in 79-93% yield fromarylhalides and vinyl or alkylzinc reagents. The replacement of arylhalides by acyl halides provides access to ketones which were produced in up to 98% yield when POPd was used as catalyst. This approach overcomes
cross‐metathesis is described. Photoinduced hole catalysis was used to promote the formation of 1,3‐diols from aldehydes and styrenes, which were then readily fragmented under acidic conditions to form the cross‐metathesis products. The use of 1,3‐diols as intermediates, rather than the energetically more demanding oxetanes, provides a new, orthogonal mechanistic strategy for carbonyl–olefin cross‐metathesis.
Catalytic Intermolecular C(sp<sup>3</sup>)–H Amination: Selective Functionalization of Tertiary C–H Bonds vs Activated Benzylic C–H Bonds
作者:Erwan Brunard、Vincent Boquet、Elsa Van Elslande、Tanguy Saget、Philippe Dauban
DOI:10.1021/jacs.1c03872
日期:2021.5.5
A catalytic intermolecular amination of nonactivated tertiary C(sp3)–H bonds (BDE of 96 kcal·mol–1) is reported for substrates displaying an activated benzylic site (BDE of 85 kcal·mol–1). The tertiary C(sp3)–H bond is selectively functionalized to afford α,α,α-trisubstituted amides in high yields. This unusual site-selectivity results from the synergistic combination of Rh2(S-tfpttl)4, a rhodium(II)
Diastereoselective Remote CH Activation by Hydroboration
作者:Jesús A. Varela、Diego Peña、Bernd Goldfuss、Dmitri Denisenko、Jiri Kulhanek、Kurt Polborn、Paul Knochel
DOI:10.1002/chem.200400023
日期:2004.9.6
thermolysis allows remote diastereoselective C-Hactivation of neighboring aryl rings. Tetrasubstituted and trisubstituted 1,1-diphenylethylene derivatives undergo a highlystereoselective 1,2-rearrangement followed by remoteC-Hactivation to lead, after oxidative workup, to a diol in which the relative stereochemistry of two stereocenters has been controlled. The mechanism of this remoteactivation has been